Digenean trematodes in Hungarian freshwater aquacultures

Occurrence of metacercariae potentially zoonotic trematodes (Platyhelminthes: Digenea) in the musculature common carp (Cyprinus carpio L. 1758) was monitored four Hungarian aquacultures. Four geographically distinct fish farms (located Northwestern, Southwestern, Northeastern and Southeastern parts Hungary) were selected for investigation. From each farm, a total 258 one-summer-old fingerlings sampled examined years 2016 2017. In addition, 2017, we 60 market size specimens (30 two-summers 30 three-summers) from most infected aquaculture part Hungary. The euthanized decapitated whereafter their (fillets) digested pepsin solution to isolate tissue morphological molecular analyses (PCR sequencing ITS region) performed. Opisthorchiid not recovered but one numerous detected carp. They identified as cyathocotylid based on characteristics by region. infection levels proved be remarkably different among farms. Carps farm large numbers metacercariae, while 8 Posthodiplostomum cuticola Northwestern aquaculture. other two (Southwestern Southeastern) no recorded. is located close protected natural wetland habitat populated rich fauna aquatic birds (potential final hosts) snails (first intermediate host) which may create higher risk neighbouring